Database Users

Nexus S 4G screen accuracy

So I took the time tonight to measure the color accuracy of my Nexus S 4G with my equipment. So without further a due:
Luminance
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Color Temperature
Gamma
RBG balance and DeltaE
(All measures used against the Rec709 standard. Using Nexus S with a slightly modified voodoo colors profile)

Cool, looks like the Nexus did pretty well
btw the images aren't loading from me, I have to right click them and open them in a new window to see them.

Pictures should be fixed, or at least showing up as more than just links now.

I have no idea what this means.

Its usually a test done for TVs to see how close your TV is to the reference standards.
In the first picture it tells you how uniform the brightness of the image increases.
The second one is how close the color is to pure white (equal balance between red, blue, and green) at every 10% increase in brightness.
The third graph is gamma. A little harder to explain but this basically shows if the display will appear darker or brighter as a whole.
The final shows the actual outputs of red, blue, and green at each brightness. The lower portion shows how much it deviates from reference.
(Any HT junkies out there, yes I know I'm using the term brightness incorrectly here only to make this more accessible)
Sent from my Nexus S 4G using XDA App

so, do you think you can make a color profile that is in every way perfect?

Not with the kernels I have seen. Most only have one point of change (ie color multipliers in Voodoo). Something perfect would take quite a bit of battery use I would imagine as most image processors that can create "perfect" picture are usually stand alone units costing $1000 plus.
I can also tell you each screen is not the same so what might be a perfect profile on my screen would be different for you. Depending on plenty of things including screen age.
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.

wingman1659 said:
Not with the kernels I have seen. Most only have one point of change (ie color multipliers in Voodoo). Something perfect would take quite a bit of battery use I would imagine as most image processors that can create "perfect" picture are usually stand alone units costing $1000 plus.
I can also tell you each screen is not the same so what might be a perfect profile on my screen would be different for you. Depending on plenty of things including screen age.
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.
Click to expand...
Click to collapse
curious wingman how do i optimize my screen. i would like to learn

Any chance you could do this on a SLCD Nexus?

devmonster86 said:
Any chance you could do this on a SLCD Nexus?
Click to expand...
Click to collapse
Joking right? Lol.
Sent from my Nexus S 4G using XDA App

wingman1659 said:
Heres my Voodoo settings I used for the measurements I took
Color profile: Voodoo v1
RGB multiplier:
R=1769117440
G=199667
B=216805280
I did not touch the Gamma settings for the measurements but there is room for change there.
Click to expand...
Click to collapse
Do you have a specific set of numbers you believe are the best for what is available currently through Voodoo?
Thanks for the great work.

Fix for black crush

Hi not sure if anyone recommended this yet but I use 2 x battery screen filter and set the filter t o white t hen set opacity to 90 percent and for youtube 80 percent and it take the black crush away hope this helps and spread it : p
Sorry dumb keyboard didn't type in white

What is this "2 x battery screen filter" where do e get it and if its an app does it need root ...please help i m feeling this phone as hopeless with this black gray pixels

My dear god, half a dozen english teachers woke up from their graves today and silently began the zombie apocalypse. I didn't understand **** of what you two said.

Kids today.

Kid zz 2 da y
Sent from my GT-N7000 using xda premium

this its about fixing black pixels in video playback on galaxy note...if u still didn't understand try to watch a dvd rip movie in a dark room
Tez

What is a 2x battery screen filter? Could you elaborate please?
Sent from my GT-N7000 using xda premium

I have been using the free "screen adjuster" , with contrast setting of -58 , other settings default, and my video`s play great now, no black crush , when i was really bad before.
John.

Tinderbox (UK) said:
I have been using the free "screen adjuster" , with contrast setting of -58 , other settings default, and my video`s play great now, no black crush , when i was really bad before.
John.
Click to expand...
Click to collapse
This drains way too much battery as it is seriously CPU intensive.

One reading this, I installed Watchdog, set to monitor all processes including system ones, I have been watching a few movies for 10-20mins and screen adjust is showing as using 0% cpu usage?
I am only adjusting the contrast not the colour, could that be the reason for my low cpu usage?
John.
PoisonWolf said:
This drains way too much battery as it is seriously CPU intensive.
Click to expand...
Click to collapse

just so everyone knows blacks usually use no power at all on an amoled display, however when you apply a screen filter everything black is now a slight tone of colour depending on which filter you added, this means that your screen will be using more power as every single pixel will always be on.

yeah, I know, but my video`s were really bad in dark scenes, total back areas of blotchyness, it was unwatchable, And i was really happy with my screen no yellow/green tinge or anything
John.
RudiRulez said:
just so everyone knows blacks usually use no power at all on an amoled display, however when you apply a screen filter everything black is now a slight tone of colour depending on which filter you added, this means that your screen will be using more power as every single pixel will always be on.
Click to expand...
Click to collapse

Just been experimenting, Im using the trial version of 'Privacy Filter' and ive got it set to white and lowered it to just barely above the bottom of the scale, and well......OP is certainly on to something, on the gamma test image I can see every step as it should be yet ive got it set so low that it seems like black is still black as in I cant notice a difference between screen off and screen on on the black parts.
Things to note though, if you set the slider too low blacks become grey again and also the app im using gives my phone lag but as a proof of concept it deffinatley works and theres no reason why devs couldnt include something like this in there roms.
I will keep experimenting with different apps and settings, Im yet to try a paid app so that will be next, ill try and get some photos up in a bit.
---------- Post added at 02:05 PM ---------- Previous post was at 01:46 PM ----------
Photos:
Side by side comparison, Without filter <-----------------------------------------------------> With filter.
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And the filter settings im using.
Edit: After some more experimenting 'Privacy Filter' by S-LINK SOFT for 85p is the one im going for, I set all the colours to 255 and set the alpha to 3 and it sorts my problems, also the app allows you to choose which apps you want it to activate in, obviously you should do some testing for yourself but this certainley sorted mine.
Edit: Still really bad blotches on certain parts of certain videos, not a solid fix overall.

Perseus screen engine : Spread your colors !

OK guys, after the sound thread, i decided to open a new thread, speaking about the new AndreiLux's baby: The color engine
WHo remember Voodoo color for S.Amoled screens like GalaxyS and Nexus S?
certainly most of you
Yesterday Andrei released his first version, included in STweaks, of his new way to control screen colors ( and more!)
let's start with a Granger Rainbow to better understand how colors are
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As said, this new engine can be found in STweaks ( You must use Perseus 32 or newer kernel )
And here are Andrei explanation about settings ( as he said, they can be not very true and surely unfinished)
image can substitute 1000 words in this case
Ok in the images you can find alse descriptions
Only a word to the setting called
Front Buffer Early Suspend Delay
Click to expand...
Click to collapse
It is used to set a dalay in which time the phone continue to draws IE is used for CRT-OFF animation ( set to 100ms to have the correct animation)
The thread is done with, in mind, the intention to collect users display's configuration and make better colours and calibration
Please indicates the screen mode base ( Dynamic,Standard or Natural) or settings will be fault.. and also all intent while you were setting things ( for example to have better colors,or simply more vivid colors etc)
Hope to see movement here !
PS:Andrei said a lot more about settings but is so hard to collect all and make clear for all, so, so far, i qill limit to above, waiting for more clear details
Users Configurations:
mamba720027
nfsmw_gr
All credits to AndreiLux for that implementation
Click to expand...
Click to collapse

woow.. nice

Well,here's mine!
Screen mode: Dynamic
Chroma Saturation Control
-4
5
-4
0
-2
0
-2
0

I think the iphone has a good screen calibration can someone simulate that?

dimi22 said:
I think the iphone has a good screen calibration can someone simulate that?
Click to expand...
Click to collapse
Won't look the same on your phone either way, as all screens are different.

Toss3 said:
Won't look the same on your phone either way, as all screens are different.
Click to expand...
Click to collapse
Yes i understand that but maybe the colors can be made more accurate and the black clipping can be solved

dimi22 said:
Yes i understand that but maybe the colors can be made more accurate and the black clipping can be solved
Click to expand...
Click to collapse
this are my values with dynamic screen, great colors for me
-4
5
-4
-1
1
-5
13
15
deep colors and black status bar.

Where is the Stweak with screen configuration?
Oops, never mind, sorry about my mistake
Sent from my GT-I9300 using xda premium

these settings don`t affect screen lifetime and quality?

Can it fix zero black level bug? The GS3 display is always like #050505. It's never really 0 Volt per pixel. Looks cheap like LCD.

This doesn't affect the whites at all. Still doesn't fix screen tint issues.

nice start..

DualJoe said:
Can it fix zero black level bug? The GS3 display is always like #050505. It's never really 0 Volt per pixel. Looks cheap like LCD.
Click to expand...
Click to collapse
Er... SGS1 wasn't pure black neither, you could see a bit of brightness in the dark.
SGS3 is a bit brighter but calling it "cheap LCD" is going a bit too far.
I still have to see a LCD screen with the same black level (and I'm in front of one of the best MVA screen with something like a 2500:1 contrast).

Yep, right. I rather meant "cheap" regarding you can still see the borders (very dark rectangle) at night. Not the overall quality.
My SGS Plus (I9001) is perfectly dark though.

burner07 said:
these settings don`t affect screen lifetime and quality?
Click to expand...
Click to collapse
I'm guessing they will as per standard amoled rules.
- Darker screen = less battery
- Some colours (red iirc) = less battery
- I also guess that higher saturation causes more battery drain cause the pixels are outputting stronger/brighter...
But really, this is more about tweaking your screen to meet your preferences - the small changes most users will make will probably have a negligable effect on battery life.

Now, if only someone could port / make this for the original Galaxy Note and it's cr**py mDNIe sh**ty failure... that'd be great .
Just a wild post here, don't mind me.

Im unable to find some of these options on stweaks. Using Perseus 33.1.

R: Perseus screen engine : Spread your colors !
Perseus 33 si using new way to calibrate colors,and will be final in next small update
Until Andrei release it,I will no more update this thread as marked obsolete at the day of today
Sent from my GT-I9300 using xda premium

oswade said:
I'm guessing they will as per standard amoled rules.
- Darker screen = less battery
- Some colours (red iirc) = less battery
- I also guess that higher saturation causes more battery drain cause the pixels are outputting stronger/brighter...
But really, this is more about tweaking your screen to meet your preferences - the small changes most users will make will probably have a negligable effect on battery life.
Click to expand...
Click to collapse
he meant will the screen get damaged.... some places it says not to mess with the colours in amoled screens... eg: screen filter apps...
even i would like to know this...
but i doubt this because andreilux knows what he is doing..
can we start a thread for sharing everyones screen settings ? or do we use this thread for that...

Here is mamba720027's latest STweaks Screen color settings for anyone who want to try while we wait for the galaxy s3 calibration. This the best i could get it at this point.
[Global Controls]
Enable Register Hook - Checked
Enable Master Sequence - Checked
[Chroma Saturation Control]
2
8
17
8
3
-8
-1
[White Colour Temperature Control]
Toggle colour temerature control - Checked
Colour Temperature
-2000K
[SCR Colour Channel Modifications]
White Colour Balance
-4
-4
-4
Primary RGB Colour Channels Addends
16
16
4
13
-50
-4
9
-26
-7
Secondary YCM Colour Channels Addends
-11
16
-16
-8
-6
-3
-14
8
-11

[Q] Lowering actual panel brightness (below minimum)

Hey guys,
I've searched these forums quite thoroughly, and I haven't found any kernels/ROMs that allow for the display brightness to go past its minimum brightness settings. If you've had an iPhone, you'll know that the iPhone's minimum brightness is so much lower than the Nexus 4's. It makes using it at night so much easier on the eyes.
In all the threads I've come across, people just suggest to use Lux, or any of the other apps that just put a filter over the screen. These just make the screen grey, and just mute the colours - they don't actually reduce the brightness past 0.
I know that lowering the minimum brightness is possible; at least it is on other devices. On the Nexus 7, M-Kernel has a file that you can edit to change the panel's minimum brightness, and on my old Xperia Play, the RootDim app [https://play.google.com/store/apps/details?id=mobi.pruss.superdim&hl=en] allowed lowering the panel's brightness.
So, has anyone come across any kernels/ROMs that actually allow reducing of the panel's brightness past 0?
Oh, and I emailed the guy who made the RootDim app, and he mentioned something about pwm drivers. Does anyone know more about that?
Thanks!

I think I was able to do this on my old phone (HTC Wildfire) using Cyanogen. But no guarantees. Also, no idea if that is still supported or works on the N4...

If it's purely about using it at night I would recommend Screen Filter. I prefer not to mess with forcing my screen to use values outside the tried and tested boundaries set by the manufacturer.
Sent from my Nexus 4 using Tapatalk 4

For what it's worth, the "lowest" brightness by default is 5%. CM lets you adjust this down to "0%" but it seems autobrightness is a little buggy.
edit: nevermind. The range for autobrightness is 5-100 by default. When manually setting brightness, I believe "0" is possible on stock? I agree there are times a dimmer setting would do. Changing gamma settings can get you deeper colors and result in a dimmer looking display. Opposite of the graying you're referring to.

thank me later
https://play.google.com/store/apps/details?id=com.haxor

K3lthuzad said:
...or any of the other apps that just put a filter over the screen. These just make the screen grey, and just mute the colours - they don't actually reduce the brightness past 0...
Click to expand...
Click to collapse
bodom_hc said:
thank me later
https://play.google.com/store/apps/details?id=com.haxor
Click to expand...
Click to collapse
or never

I'm wondering about this too, in bed at night the screen is too bright on the eyes which makes the reading time much less,
on amoled screens its great due to no backlight which doesn't make the eyes tired,
there must be a way to reduce the backlight, but it may make the backlight flicker if undervolted, which would be worse on the eyes

republicano said:
I'm wondering about this too, in bed at night the screen is too bright on the eyes which makes the reading time much less,
on amoled screens its great due to no backlight which doesn't make the eyes tired,
there must be a way to reduce the backlight, but it may make the backlight flicker if undervolted, which would be worse on the eyes
Click to expand...
Click to collapse
Have you tried playing with the gamma settings and dropping the brightness down to 0 manually (autobrightness only goes down to 5%).
Halfbreed is pretty decent and results in a "dimmer" display without washing/graying everything. Only problem is under daylight, it's not effectively as bright.

I'll try messing with the brightness and gamma settings. It's a shame there isn't a better alternative right now.
Maybe, in the future, a developer makes a kernel with this built in (if possible). Fingers crossed! :/

For what it's worth, I think you'll find 0% brightness and halfbreed to be exactly what you're looking for.

Download twilight and try it. It has an option to lower the screen brightness further...
Sent from my Nexus 7 using xda app-developers app

Bumping my own thread:
I talked to the Nexus 7 (2012) kernel dev who managed to lower the panel minimum brightness, and he pointed me toward this:
https://github.com/CyanogenMod/lge-...ch/arm/mach-msm/lge/mako/board-mako-display.c
I'm hoping a Nexus 4 kernel dev will see this (or someone who knows what to do with it). He said it might be possible to do on our displays. Also, go check out M-Kernel if you still have a 2012 Nexus 7.

So, we just need to chance it and compile the kernel?
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Sent from my Nexus 4

We can try. I just don't know how to 1. Change it and 2. Compile a kernel LOL

I will try to do it, will post here if it works
Sent from my Nexus 4

Your setting of color correction

Hey guys,
i'm interrested in your settings of colour correction. I think my personal setting looks better than stock setting.
Here we go:
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Where is that menu?
Sent from my LG-D855 using XDA Free mobile app

elmalote said:
Where is that menu?
Sent from my LG-D855 using XDA Free mobile app
Click to expand...
Click to collapse
Settings->General->Accessibility->Color Adjustment

streilu said:
I think my personal setting looks better than stock setting.
Click to expand...
Click to collapse
What is your personal settings?
This setting is very confusing for me, it is useless.

All you can do is positioning the ring. I like the setting with the ring put near camera icon, but its not that easy.
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i've set the ring in the middle..in that position it loses too much blue colors...and a bit above yours...too dark for me in that position.
that tool is a good idea but is too hard to set...

We all have different taste on what looks good and what doesn't. What's point of this thread again?

This is mine. Just trying to kill a little but of the washed out look. Screen is kind of a letdown, but this helps a bit.
Sent from my VS985 4G using XDA Premium 4 mobile app

shook187 said:
We all have different taste on what looks good and what doesn't. What's point of this thread again?
Click to expand...
Click to collapse
we may have different screens too

shook187 said:
We all have different taste on what looks good and what doesn't. What's point of this thread again?
Click to expand...
Click to collapse
What's the point of your comment? I think the point of the thread is stated well, and it's legit. I'm also curious what people are setting their color correction too.
You may not be, but it isn't all about you.
Sent from my VS985 4G using XDA Premium 4 mobile app

The point of the thread is to give people an idea of what others are using to compare or to give others a starting point.
Sent from my LG-D851 using Tapatalk

Here's mine. I'm very happy with it.

I would rather prefer a tool to set the white level of the screen.
Compared my G3 to the wife's G2 today, my screen is very pinkish, hers is a perfect white, this is the only concern I do have with my G3

So one thing I have noticed is vertical adjustments change black and white and horizontal adjustments change color. Try making a setting and toggle on and off to compare, i like to go through my app drawer to see if the dark colors are too shaded. Another thing i do is use a reference like xda in chrome to see if the brown and yellow theme looks like it does on my laptop for a good consistency and nice deep color. I'm sitting at the camera icon as well but thought I'd share some ideas on testing and using visual references on things you've seen across different displays to know correct color tones.

Horizontal does hue..... which will more or less completely screw up your phone's color balance
Vertical does the contrast. Go into your laptop display or monitor and crank the contrast, your colors will start to haze and wash out a bit. Dropping it a smidge should make the blacks a bit more, well, black and your colors pop a little bit more.
It's be much nicer to have granular controls of the different colors... but at least this is something.

LeoRex said:
Horizontal does hue..... which will more or less completely screw up your phone's color balance
Vertical does the contrast. Go into your laptop display or monitor and crank the contrast, your colors will start to haze and wash out a bit. Dropping it a smidge should make the blacks a bit more, well, black and your colors pop a little bit more.
It's be much nicer to have granular controls of the different colors... but at least this is something.
Click to expand...
Click to collapse
Thanks for clearing up the hue and contrast part. I was going off of what i saw from trial and error and wasn't 100% sure of the effects of hue and contrast.

DylanMk2 said:
Thanks for clearing up the hue and contrast part. I was going off of what i saw from trial and error and wasn't 100% sure of the effects of hue and contrast.
Click to expand...
Click to collapse
Yeah.... Hue is better known as "Why the F does my screen look like a smurf on an acid trip puked on my screen?" Any adjustment to that needs to be extremely fine and each color needs to be discrete. An all-in-one slider is about as useful as that HUE knob that us old-timers used to have on our televisions. Made everything look like a cheesy alternative music video from the early 80's.

Doesn't this affect the entire screen and the whole phone? Apps included?